Process for producing articles of refractory metal alloys



Patented Apr. 7, 1931 UNITED STATES PATENT OFFICE nnmumr vororninnnn Anno'r'ro norms, on ssnn, GERMANY, assmnons T ramp. xaurrax'rmuensnnscnarr, or ESSEN-ON-THE-RUHR, enemy PROCESS FOB'IPRODUCINGARTICLES 01 BEIRAGIORY'METAL ALLOYS Io Drawing. Application filed May 3,1829, Serial No. 360,826, and in Germany May 2, 1928.

The invention has for its object a new process for the production of analloy which consists of carbide of tungsten or molybdenum and of a lowermelting metal or metalloid.

This object is obtained according to the invention b melting down analloy consisting of said re ractory metals and of a lower melting metalor metalloid and carbon, and by pulverizing and sintering the mass.

1 The process may be performed e. g. in the following manner:

In a carbon or graphite resistance furnace an alloy is melted downcontaining at least 80 per cent of tungsten, at most per cent 15 of alower melting metal or metalloid (e. g. nickel, chromium, cobalt, iron,or silicon) and carbon. After solidification this alloy is pulverized asfinely as possible and shaped to pressed bodies which are finallysubjected go to a sintering rocess that intimately unites the particles0 the bodies. The temperature required for the sintering o eration liesat about 2200 to 2400 degrees The sintered alloy produced in this manneris remarkable when compared with a cast alloy of the same compositionfor its greater ability to withstand the shocks to which tools areunavoidably exposed. In comparison with an alloy of the same compositionbut obtained by sinterin a mixture of carbide of tungsten or moly denumand of a lower melting auxiliary metal the present alloy possesses theadvantage, especially important for tools, that the'finished alloyresists a much higher heating than the former.

We claim:

1. The process of producing articles of refractory metal alloys, whichcomprises melting together a refractory metal, a metal or metalo1dhaving a lower melting point, and carbon; allowing the fused massjosolidify; pulverizing the solidified mass, pressing the powder soproduced into a body of any desired shape, and then sintering the body.

2. The process of producing articles of refractory metal alloys, whichcomprises melting together one of the metals tungsten or molybdenum, ametal or metalloid having a lower melting point and carbon; allowing thefused mass to solidify; pulverizing the solidified mass, pressing thepowder so produced into a body of any desired shape, and then sinteringthe body.

The foregoing specification signed at gggggne, Germany, this 18th day ofApril,

HERMANN VOIGTLFLNDER. OTTO KAUFELS.

